抄録
The mechanical properties of 25%Cr-Ni sintered stainless steels were studied in comparison with sinterability originating in α/γ phase constitutions.
The results were summarized as follows:
(1) The highest tensile strength was obtained at the ratio of α/γ phase of about 2 : 1, and the resultant ductility was also relatively good because of promoted sinterability for compacts.
(2) The resistance to impact showed the same change as the ductility with the phase constitution, though the low temperature brittleness was observed in sintered materials containing 6% or less of Ni.
(3) The fatigue strength also exhibited the highest value in the above-mentioned two phase range in relation to matrix hardness, while the endurance limit ratio was 0.3-0.4, and getting a little larger in the vicinity of the α-single phase field.
(4) The tensile strength at temperature over 600°C was independent of the phase constitution and improved with the increase of Ni. The effects of Ni on the creep rupture strength was in general larger than that on the short time hot-tensile strength.
